* {
    box-sizing: border-box;
}

body {
    margin: 0px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

header {

    background-color: cornsilk;

}

/* header h1 {
    text-align: center;
    font-size: 40px;
    color: white;
} */

/* header {
    padding: 40px;
    background-color: rgb(17, 124, 143);
} */

nav {
    display:flex;
    background-color: #333;
    overflow: hidden;
}

nav a {
    text-decoration: none;
    padding: 20px;
    text-align: center;
    float: left;
    color: white;
}

main {
    background-color: white;
    text-align: center;
}

h2 {
    padding: 20px;
}

section:nth-child(even) {
    background-color: rgb(241, 241, 241);
}

section {
    min-height: 100vh;
}

video {
    padding: 10px;
}

iframe {
    height: 75vh;
}

img {
    padding: 10px;
}

section h5 {
    margin: 40px;
}

footer {
    background-color: #333;
    overflow: hidden;
}

footer a {
    text-decoration: none;
    padding: 20px;
    text-align: center;
    float: left;
    color: white;
}

.banner {
background-image: url(../img/logo/l1.gif);
height: 10vw;
min-height: 100px;
background-repeat:no-repeat ;
background-position: top center ;
background-size: 10%; 
background-attachment: fixed;

}


.flex-align-left {

    margin-left:auto ;
}


.menu-btn:hover {
background-color:white ;
color: black;


}

@media screen and(max-width:700px) {
    nav{

        flex-direction: column;
    }
    
}